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- W2312995068 abstract "Silica chloride was prepared from porous silicas by reaction with SOSI2. Further reaction with benzyllithium resulted in bound benzylsilicas which, upon sulfonation with chlorosulfonic acid, yielded cation exchangers in the H+ form. Elemental analyses and titrations of the exchangeable protons indicated ion exchange capacities of up to 0.4 meq/g which reflected from 66 to 95% sulfonation of the bound benzyl moieties. The capacities are intermediate to those for superficially-porous ion exchangers and ordinary polystyrene-divinylbenzene based phases. The latter tend to bleed UV-absorbing materials which interfere in the analysis of trace quantities of materials in natural products. Sulfobenzylsilica cation exchangers in the Na+ form were used for the separation of proline from nitrosoproline by liquid chromatography. There was no evidence of bleed when a UV column monitor (254 nm) was set at 0.04 absorbance units full scale. This is significant since the presence of nitrosoproline is confirmed by mass spectroscopy and bleed from ordinary ion exchangers could be a significant source of interference in the analysis. Particles of a sulfobenzylsilica in the Ag+ form were used as a stationary phase in TLC. At approximately 2% loading of Ag+, cis and trans isomers of fatty acid methyl esters or mono-, di-, and trisaturated triglycerides were separated. Repetitive development on the same plate produced no significant change in Rf. The plates are stable to solvents as well as light and require only one-tenth the amount of Ag+ utilized in AgNO3 impregnated plates." @default.
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- W2312995068 date "1974-10-01" @default.
- W2312995068 modified "2023-09-26" @default.
- W2312995068 title "Bound-Monolayer Cation Exchangers for the Analysis of Biochemically Significant Molecular Species" @default.
- W2312995068 doi "https://doi.org/10.1093/chromsci/12.10.555" @default.
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